package TestDemo;

import java.util.Arrays;

class A{
    int a;
    public A(){

    }
    public A(int a){
        //this.a = a;
    }
}

public class Test {
    public static void main(String[] args) {
        A a = new A();
        System.out.println(a.a);
        A a2 = new A(1);
        System.out.println(a2.a);
    }
    /*public static void main1(String[] args) {
        int[] arr1 = new int[10];
        int[] arr2 = arr1;
        arr2[3] = 10;
        System.out.println(arr1[3]);
        int[] arr3 = Arrays.copyOf(arr1,arr1.length*2);
        String arr = Arrays.toString(arr3);
        System.out.println(arr);
    }*/
}
